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High-selectivity method for detecting p-phenylenediamine in aqueous solution

A p-phenylenediamine, high-selectivity technology, used in material excitation analysis, fluorescence/phosphorescence, etc., can solve problems such as high cost and complex operation

Inactive Publication Date: 2015-11-11
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the defects of complicated operation and high cost of existing p-phenylenediamine detection methods, and to provide a detection method for highly selective detection of p-phenylenediamine in aqueous solution

Method used

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  • High-selectivity method for detecting p-phenylenediamine in aqueous solution

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Embodiment

[0019] A method for highly selective detection of p-phenylenediamine in aqueous solution, comprising the following steps:

[0020] 1), in the round bottom flask of 50mL, add the mixed solvent 20~30mL of ethanol, acetic acid and water three, the volume ratio of ethanol, acetic acid and water three is ethanol: acetic acid: water=5: 1: 19;

[0021] 2), add salicylaldehyde 8 ~ 15mmol into the round bottom flask, heat and stir to make salicylaldehyde completely dissolved;

[0022] 3) Add 3 to 5 mmol of the solution to be tested into the round bottom flask; stir evenly, and place at room temperature for 30 to 40 minutes;

[0023] 4) After stirring evenly, 2 mL of the solution was taken out, and the fluorescence spectrum was measured at an excitation wavelength of 400 nm, and the buffer solution was HEPES buffer solution with pH=7.0.

[0024] Whether the fluorescence intensity is enhanced by fluorescence spectroscopy can determine whether p-phenylenediamine is contained in the solut...

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Abstract

The invention discloses a method for identifying p-phenylenediamine in an aqueous solution by using aggregation-induced enhanced emission mechanism. According to the method, by using the facts that salicylaldehyde and p-phenylenediamine can compound N, N'-bis (salicylidene)-p-phenylenediamine Schiff base having an aggregation-induced enhanced emission phenomenon, namely, the N, N'-bis (salicylidene)-p-phenylenediamine Schiff base is non-fluorescent or has relatively weak fluorescence in a good solvent (such as, ethyl alcohol), and has enhanced fluorescence in a poor solvent (such as, water), the in situ test for neutral molecules is achieved, and a novel method for detecting p-phenylenediamine in the aqueous solution is provided. The method is easy and efficient, and p-phenylenediamine can be detected from a mixture of isomerides such as o-phenylenediamine and m-phenylenediamine while the other two isomerides are not detected.

Description

technical field [0001] The invention relates to the field of reagent detection, in particular to a method for highly selective detection of p-phenylenediamine in aqueous solution. Background technique [0002] As an important chemical raw material, p-phenylenediamine is usually used in the synthesis of hair dyes, but because of its strong sensitization to the human body, it can form highly nucleophilic oxidation products that interact with DNA in the human body Therefore, p-phenylenediamine is internationally recognized as a carcinogen. Random discharge of sewage containing p-phenylenediamine not only seriously pollutes the environment, but also endangers human health. At present, the main measurement methods for p-phenylenediamine include square wave stripping voltammetry, gas chromatography and liquid chromatography. These detection methods are not only complicated to operate but also high in cost. In addition, using the above detection method, p-phenylenediamine cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 边延江王璐琼曹福祥钟克利侯淑华汤立军
Owner BOHAI UNIV